your correct in saying eden could go to st marys bill, theyre the set CFS COQ for there.
but apparently MFS still had enough appliances to go there.. im sure if the fire had gone fourth alarm, wud have been a very differant story, but apparently they could still stretch there own resources to cover. for quite a while 321 was in 40, and even got a call to respond with eden to a reported stobie alight during that time..